socialite jill kelley. kelley is the woman who went to the f.b.i. with anonymous threatening e- mails that agents traced to petraeus' alleged girlfriend paula broadwell. general allen says he did nothing wrong. >> general allen is entitled to due process in this matter. >> reporter: a senior u.s. defense official says the latest investigation centers on 20 to 30,000 pages of e-mails and documents from allen's communications with kelley. kelley's brother defended her character. >> i know who my sister is. i know she's a good mother and a good wife. >> reporter: allen remains in command of 68,000 u.s. troops in afghanistan. he was supposed to be here on capitol hill this week for hearings on his nomination to be supreme u.s. commander in europe. now that's on hold. he resigned friday and admitted to the extramarital affair. his former aide says he's extremely remorseful. >> he said in those words i screwed up. what i did was wrong. there's no excuses for it and he's not going to try to explain it away. >> reporter: broadwell hasn't been seen since the scandal broke. monday night f.b.i.